Overview
The L9396 is an integrated power management System Basis Chip designed by STMicroelectronics, targeting a wide range of automotive electronics applications. It is particularly suited for systems such as ABS, EPS, and Transmission, and is compatible with single 12 V battery systems. The device integrates multiple power supply regulators, including a switched mode power supply for pre-regulation, three independent integrated linear regulators, and a configurable regulator for microcontroller supply. It also features advanced fail-safe functionality, watchdog control, and system monitoring, making it a comprehensive solution for automotive power management needs.
Key Specifications
| Parameter | Description |
|---|---|
| Operating Voltage | VBATP: 4.5 V to 19 V with boost; 6 V to 19 V without boost |
| Ambient Temperature Range | -40 °C to 135 °C |
| Package | TQFP64EP (10x10x1mm) |
| Boost Regulator | 9 V, 300 mA, 2 MHz (optional) |
| Buck Pre-regulator | 6.5 V / 7.2 V, 1 A, 465 kHz |
| LDO Regulators | 5 V, 250 mA; 3.3 V / 5 V, 100 mA |
| Configurable Regulator | 0.8 V to 5 V, up to 1 A in buck configuration, up to 750 mA in linear configuration |
| Remote Sensor Interface | Four channels, wheel speed sensor protocol, tracking regulator supply (3.3 V - 5 V) |
| Watchdog | Double watchdog (Q&A WD and time-windowed WD) |
| ADC | Integrated 10-bit ADC with system diagnostics |
Key Features
- AEC-Q100 qualified and full ISO26262 compliant, ASIL-D systems ready
- Integrated boost regulator for deep cranking pulse and weak battery conditions
- Integrated buck pre-regulator for improved power efficiency
- Multiple integrated linear regulators (LDOs) for various supply needs
- Configurable and programmable regulator with external FET for microcontroller core supply
- Spread spectrum approach to reduce EMC emissions
- Four channels configurable remote sensor interface with wheel speed sensor protocol and tracking regulator supply
- High-side pre-drivers for fail-safe and motor pump control
- SPI communication bus and configurable I/O levels (3.3 V / 5 V)
- Configurable fail-safe functionality and fail-safe output (FSN)
- Wake-up input and low-side general purpose output with programmable PWM control
- Integrated 10-bit ADC for system diagnostics and discrete analog inputs for ADC measurement
- Voltage monitoring (UV/OV) on all regulated rails and temperature monitoring with thermal shutdown
Applications
The L9396 is designed for a variety of automotive electronics applications, including:
- Anti-lock Braking Systems (ABS)
- Electric Power Steering (EPS)
- Transmission systems
- Other automotive electronics requiring robust power management and fail-safe functionalities
Q & A
- What is the primary function of the L9396?
The L9396 is an integrated power management System Basis Chip designed for automotive electronics applications, providing multiple power supply regulators and advanced system monitoring and fail-safe functionalities.
- What are the operating voltage and temperature ranges of the L9396?
The operating voltage range is 4.5 V to 19 V with boost and 6 V to 19 V without boost. The ambient temperature range is -40 °C to 135 °C.
- What types of regulators are integrated into the L9396?
The L9396 includes a boost regulator, a buck pre-regulator, multiple linear regulators (LDOs), and a configurable regulator with an external FET.
- Does the L9396 support fail-safe functionality?
Yes, the L9396 features configurable fail-safe functionality, including fail-safe output (FSN) and high-side pre-drivers for fail-safe and motor pump control.
- What communication interface does the L9396 use?
The L9396 uses an SPI communication bus and supports configurable I/O levels (3.3 V / 5 V).
- Is the L9396 compliant with automotive safety standards?
Yes, the L9396 is AEC-Q100 qualified and full ISO26262 compliant, making it suitable for ASIL-D systems.
- What is the purpose of the integrated ADC in the L9396?
The integrated 10-bit ADC is used for system diagnostics and can measure both internal and external voltages as well as device temperature.
- How does the L9396 handle voltage monitoring?
The L9396 includes voltage monitoring (UV/OV) on all regulated rails to ensure stable power supply.
- Can the L9396 be configured for different application scenarios?
Yes, the L9396 offers functional configurability through SPI registers, allowing it to fit many application scenarios.
- What is the package type of the L9396?
The L9396 is packaged in a TQFP64EP (10x10x1mm) package.
